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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4358ebcda3a0ec53aac37e0b51a83b7a4db0cd847c1594752a270dc08e9d2a71' 
  AND token = 'AZP63lpeTWPbq6i682YMWd33lgUbnt4zMlHerVH8CmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}